The origin of the world.Thoughts about the origin of the world there are plenty but can be divided into 2 main theories, including the theory เนบู La (nebular)., and later developed a theory protoplanet (protoplanet) and theory of planetesimal (planetesimal) (images and 2 3).1. Theory of Nebula (nebular hypothesis) theory protoplanet (protoplanet) explained that the substance is a source of the sun.And planetary nebula, which consists of a group of gas and dust in the sky. Later, a group of nebular these shrink and paddlewheel, slowly at first, and multiply the faster the cause center and ring revolves around the point. The center mass together as the sun rises the center. Contraction due to gravity causes heat up gas group. Each group. Each ring has created a planet host of the sun. In this case, the age of the sun.
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